Tumor necrosis factor receptor superfamily member 6B (TNFRSF6B), also identified as DcR3 or M68, is a secreted member of the Tumor Necrosis Factor (TNF) receptor superfamily, neutralizes three different TNF ligands: TNFS14/LIGHT, TNFSF15/TL1A and TNFSF6/FasL. TNFRSF6B binds to FasL and inhibits FasL-induced apoptosis. It can also bind to LIGHT and suppresse LIGHT-mediated apoptosis. Interaction of TL1A with DR3 promotes T cell expansion during an immune response. Expression of DcR3 is significantly elevated in patients with a range of cancers and autoimmune diseases.